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Tube Health Check
In order to use the function a pressure measurement device (separate order) directly
connected to the analog input of the SITRANS FC is necessary. Based on iteration
process, SITRANS FC finds the value of viscosity μ that returns a Δp
measured Δp.
Fig. 104: Positioning of pressure taps
①
②
③
Application example:
In this application example the Viscosity function returns a reference value used to
activate a heating system and the SITRANS FC is using HART communication.
20.5 Tube Health Check
General
The Tube Health Check function is a valuable diagnostic function to evaluate the status of
the measuring tubes of SITRANS FC.
Tube integrity
The function is able to measure periodically the change of the stiffness of the measuring
tubes and gives the possibility to set up a real predictive maintenance system or to detect
corrosion or clogging of the measuring tubes. The measurement values can be stored in
the internal microSD card or transmitted via HART, Modbus or PROFIBUS PA protocol
and therefore integrated in the customers condition monitoring system.
An alarm or an external event can be activated directly from SITRANS FC in case the
measured value exceeds a threshold defined by the user.
20.6 Measurement of heat quantity
The function allows to evaluate the total fuel calorific value of the measured fluid.
The function can work with a constant value of the calorific value of the fluid, but in order
to have a precise evaluation we suggest to use an additional device like a gas
chromatograph (not included in the supply). The external device that supplies the
instantaneous calorific value is connected with the current input of the transmitter. Based
on the mass flow, the total calorific energy of the fluid is calculated as below:
2
1
Heat exchanger
Pressure tap 1
SITRANS FC
6
3
4
④
Differential pressure transmitter
⑤
Pressure tap 2
⑥
HART
A5E52748362-AA, 2023/08
FC5x0
Advanced functions
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